Substation-telephone.



0. M. LEIGH.

SUBSTATION TELEPHONE.

APPLICATION FILED MAR. 15. mo.

1,1,45 Patented July 27, 1915.

fl x/gm 9 WWW COLUMBIA PLANOGRAPH c0.. WASHINGTON, D c.

OSCAR IVL'LEICI-L'OF GENOA, ILLINOIS, ASSIGNOR TO CRACRAIT-LEIOI-I ELECTRIC COMPANY, OIE GENOA, ILLINOIS, A CORPORATION OF ILLINOIS.

SUBSTATION-TELEPHONE.

Application filed March 15, 1910.

To all whom it may concern Be it known that I, OSCAR'M. LEIGH, a citizen of the United States, residing at Genoa, in the county of Dekalb and State of Illinois, have invented a certain new and useful Improvement in Substation-Telephones, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to sub-station telephones and more particularly is adapted to provide a sub-station telephone circuit, which telephone circuit is of the local battery type, and which circuit dispenses with the generator, and in lieu thereof provides primary current supplying means for the purpose of actuating the signal at the central station.

In the preferred embodiment of the invention I use two separate current supplying means, each one of which may, of course, consist of a battery of one or more cells, one current supplying means being used for talking purposes and the other being associated therewith cumulatively when sending a signal to the central station. The switchhook which I prefer to employ when mv invention takes this form, is of the slow acting type, so that certain contacts can be made before said contacts and others may be made and broken. Broadly speaking, however, my invention contemplates the use of a switchhook which sends a momentary impulse of appreciable time interval from a primary battery source to the central station to actuate a signal in front of the operator. In one form of carrying out my invention therefore, the switchhook is so arranged that the primary battery which is used at the substation and which furnishes both talking and signaling current is so associated with the switchhook that when the switchhook is moved by the withdrawal of the receiver, the battery is connected to the line wires orline circuit in such a way that a delayed impulse is transmitted to the central station, which impulse however, ceases when the switchhook has reached its limitingposition, at which time it associates the battery with the local talking apparatus. In the form of the invention which I illustrate herein, I subdivide this Specification of Letters Patent.

Patented an at, 1915. SerialNo. 549,515. 7

battery into two batteries, one of which serves as the talking battery and the other as an auxiliary or additional signal sending battery, but of course the invention is not to be so limited.

I Wlll describe my invention more in detail by reference to the accompanying drawing lllustrating the preferred embodia in such manner that when no plug is inserted in the jack the drop is across the line circuit, and when the plug is inserted in the ack establishing bridging contact with the conductors 3 and 4, the magneto drop 2 is cut out of the circuit. These line conductors 3 and 4 extend to a sub-station, at which substation I have a telephone instrument 5. This telephone instrument has a signal receiving device 6. The telephone instrument is shown diagrammatically with the various hinges 7, which are used for interconnecting apparatus in the cabinet and on the closure as illustrated. An induction coil 8 in the telephone has its primary winding associated with the transmitter 9 and these devices are associated with springs 10 and 11, respectively of the switchhook, which has the switchhook lever 12. The receiver 13, whichis adapted to actuate the switchhook, is connected from the linewire 4, through the secondary of the induction coil 8 to contact spring 14L. Contact spring 15 is associated with the line wire 3. The

transmitter battery 16 is associated with the.

winding with the line wire I and has its other terminal connected to the contact spring 21. Now it will be apparent that the switchhook lever 12, which is hinged at 22, actuates by means of its roller 23, two separate and distinct controlling springs, namely the springs 15 and 21. A space is left between the springs 15 and 21, as shown, so

' that the roller 2 3' after uniting spring .11,

18 and 21, takes some time before it reaches the controlling spring 15, which closes the receiver circuit and the transmitter circuit and opens the circuit of the auxiliary battery 19 to the line wires.

The operation is this. When the receiver 13 is removed from the switchhook lever the switchhook lever at first closes contact through the springs 11, 18 and 21. This establishes a circuit which begins at line wire 4, passes through conductor 20, ringing battery 19, transmitter battery 16, contact spring 10, contact spring 15andends at line wire 3. Thus we have the two batteries 16 and 19, or rather the transmitter battery plus the booster battery 19, which are connected; serially to the line circuit, and whose combined voltage is sufiicient to send enough current over the line wires to operate the drop "2. The switchhook in its further movement engagesspring 15 and thereby opens the connection between the spring 10 and the spring 15, after said connection has remained while the switchhook istraveling between springs 21 and 15, and thus opens the connection of the batteries 16 and 19 to the line wires. The transmitter and the primary winding of the induction coil are then in series with the transmitter battery 16. The further movement of the switchhook engages springs 14 and 15, which thereby connect the receiver and the secondary of the induction coil 8 in bridge of the line wires, as is readily apparent. The

. transmitter battery, of. course, should not be too strong at any time; therefore it is impossible to at present use the transmitter battery to perform the function of signal sending. With my improved arrangement I provide the booster. battery which need not be of any great current carrying capacity, and which I prefer made to give a steady voltage and for a long life and low current output as' against the transmitter battery, which must have a higher current output and which can, therefore, not have such a long life. The main thing that is necessary with my invention is to provide a small amount of current at an increased voltage to operate the drop, and this is accomplished through the use of the battery 19 of low current output, which battery in practice I find works very satisfactorily if it consists of three cells of dry battery. The transmitter battery usually consists of two cells. The slow acting switchhook gives the two batteries time to act in energizing the drop, whereafter the talking connections are established.

While I have herein shown and particularly described the preferred embodiment of myinvention, I do not limit myself to the precise construction and arrangement as herein set forth, but

Having thus described my. invention, what I claim as new and desire to secure by Letters Patent is:

1. A substation telephone havinga transmitter, a transmitter battery, an auxiliary signal sending battery, and a switchhook havmg means adapted to connect said batterles 1n series with a line circuit to send a signal during the movement of said switchhook from one limiting position to the other and in its limiting position to connect only said transmitter battery with said transmitter.

2. A substation telephone having a transmitter, a transmitter battery, an auxiliary signal sending battery, and a slow acting switchhook having means adapted to connect said batteries in series with a line circuit to send a signal during the movement of said switchhook from one limiting position to the other and in its limiting position to connect only said transmitter battery with said transmitter.

3. .A substation telephone having a slowacting switchhook, two sets of batteries, and a transmitter, said switchhook having means operable when said switchhook is actuated to momentarily serially connect said sets of batteries to send a signal, and then in its further movement to connect one only of said sets of batteries with the transmitter.

4. A substation telephone having a switchhook, a plurality of batteries, and a transmitter, said switchhook having means operable when said switchhook is actuated to momentarily serially connect all of said batteries to send a signal, and then in its further movement to connect a part only of said batteries with the transmitter.

5. A substation telephone having a switchhook, a plurality of batteries, and a transmitter, said switchhook having meansoperable when said switchhook is actuated to momentarily serially connect all of said batteries to send a signal, and then in its further movement to connect a part only of said batteries with the transmitter, said means including a spring actuating device and a plurality of controlling springs, said device being disengaged from one spring beiting position to the other and in its limiting position to connect only said transmitter battery with said transmitter.

7. A substation telephone having a transmitter, a transmitter battery, an auxiliary signal sending battery of low current output, and a slow acting switchhook having means adapted to connect said batteries in my name this fourth day of March A. D. series with a line circuit to send a signal 1910. during the movement of said switchhook from one limiting position to the other and 5 in its limiting position to connect only said Witnesses:

transmitter battery with said transmitter. O. M. WERMICH, In Witness whereof, I hereunto subscribe MAX W. ZABEL.

OSCAR M. LEIGH.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

